Wheel truing device



WHEEL TRUING DEVICE Filed Aug. 24, 1935 2 Sheets-Sheet 1 Wifneas Ifivenzor Dec.21,1937. Rw FULLER 2,102,841

WHEEL TRUING DEVI CE Filed Aug. 24, 1955 2 Sheets-Shet 2 Patented Dec.21, 1937 UNITED STATES.

PATEN OFFICE Production Machine Company, Greenfield, Mess? a p erefis Maachu tt Application August 24,

1.935, Serial No. 37,793

Claims. (01. 125 -1 1) The present invention relates to a' wheel truingdevice for grinding and polishing wheels and is designed moreparticularly for use on that type of machine in which the spaceavailable for the 5 tr-uing device is restricted. as, for example, incertain types of machines employing a belt feed for rotating and feeding:the Work. 1

it is an object a; the invention to provide a truing device which may bepermanently attached to the machine, but which will be completely out ofthe way of the operator .or the work when not in use.

It is a further object to provide .a construction which permits thedevice to be positively and rigidly locked in position when the truingopera tion is being performed, thus eliminating any chattering of thetooland thereby .securing a more uniform and exact Wheel surface.

A further object of the invention is to provide a constructionwhich-will inno way interfere with the changing of wheels either to adifferent size .or to .aJdifierent type or material, and ,inyvhichvarious typesof tools may be used interchange- {30 .erative position .onthe wheel casing, the dotted *lines-representingthe device thrown backon the casing in inoperative position; Fig. 2 is an, end view of thedevice Fig. 3 is asideelevation, ona reduced scale, of a polishingmachine vof wellknown -,ma.nu aetu e. w t he t uinadevice on the wheelcasing, showing the mechanism for moving the wheel toward and away fromthe truing device; Fig. A: is a pe'rspectiye ylew of the tool {holder,with a tool or stick .of abrasive ma- ,40 teria th isev ra p r s esalie' ie b t pgrated in order to illustrate more clearly their stmeiienan relation; L-Ei 51 1a l i e ano}; s owin a too holder 'fP ho fi ee aknife to tr m n slo poli hin whee 'a $5 a plan View of the knife used.in the holder. of

Fig. 5; Fig. 7 is a side elevation of aftool'iholder i am nd i wp sa 7The truin g device com prises, generally speakto 3mm to o n ai p ri l wmn e upon the hood or io ther fixed portion of the machine. wh inofl nuse t e- 3 n h e -r11 b tapped 1-9. swun P ck u 2 th in use the arm andtool are positi 5 a e tlxed aputm ntasaies rial such as carborundum istobeiisedf oi tru'ing also has thet im ul boss. r exile fa e n the a m ir gid y c emp dwab}? @2 iust ng an ed dev ces are provided for bringingthe tool and wheel surface proper relative position and causing the toolto operate acros th ace o l he'wh e 5 he wins dei' fi .e he d awingqgmpr'ises an arm I l pivotally mounted "on the hood or ca s;- ing 13 fe po i in whee :hymeans of sum s ait I c r ed by l gs 1.9 wh h m y beformed as an integral part of the wheel hood. Thehq s h sn a utment 1; Wt a ree??- ed stud 23 projecting from the face thereof. when e t a ns dece i n Qp r i Pos tion. a conta t fac n th arm bear-. .again abutmen Tar s held r gidly ag a ut en b m an of a in e nally P sleeve tfi'f r een t lqw end of th pindle 21 which is slidingly and rotatably mounted inthe am t A and rip or wheel 29 onf upper end ,oI the pin le afi rqs aniee means for rotating the spindleand sleeve to ;clamp the arm ,fixedlyin position. slidingly mounted n the -vetfie.. e a a th front or freeend of the arm -,l t e toql 'holdn carriage .33. Thi ismove e p'n th'fg'uid way'toieed the tool aQlOSS the face of the grinding or polishingwheel bymeans of the feed 34 and hand whee 35- S u n a inc ined t asverse bor n t carria eb th clamp ng bolts at is the gyl ind rj cal shak 3; o t-.1 tqol ho er ountin o hos 1-39 w ch in ture i Pro de w a b l land clamping bolt {H tor thetool holder proper. ,As shown in Figs, {1,5,7, ands; the holder comprises a cylindrical'men berjm adapted to be,secured in the bo re' of j the mo ting" or fpo's] 39 landto l holdingorifclaznn ps .1 ans o f rm adap ed to t e art ul r pe pi i q'p emploed. Thus inthe Ordinary type 'of wooden wheel with abrasivecoating'where a v stick of 'abras amatethe wheel, 'thelholdefwillbe asshowniin' 'Fig. 4 wherein the cylih'dricahmember 33- is provided with anabutment piece'45 having" the shoulder 4! to engage the face ofthe'abrasive stick 149, a cap piece'or clampingmemberjl lbeing tightlyclamped against the other two faces of ;the1stick by the clamping bolt53 which passes throu h slot 55 in the cap piece and entersithethreadedhole-5.1 in the abutment memhe f f eucap pi 5,0 is formed with theclamping faces 59, and shgnld rs .61, .for engagemen wit he st A? Lancontact .wi e ;fa ce of the ,abu me t s ihatwlle pant ar tl niedteeeigeaa p55 firmer contact and more even distribution of pressurewill result and there will be less liability of fracture of the stick.

The bodily movement of the wheel l5 within the hood l3 to bring thewheel into proper enagement with the truing tool is obtained by mountingthe wheel shaft 65 in bearings in the upper end of lever 61 pivoted at69 and having the downwardly and forwardly inclined extension or arm II.By means of the hand wheel 13 and the screw shaft 15 suitably connectedto the end of the extension, the lever 61 may be adjusted about itspivot 69 to the desired position for' the proper operation of the truingtools or devices.

The main driving pulley 11 being co-axial with the pivot of the wheelcarrying lever, the tension of the driving belt 19 is unaffected by suchadjusting movement of lever and wheel. A belt tightener comprising theidler pulley 8| mounted on arm 83 also pivoted at 69 with slot 85 andbolt 81 affords means for adjusting the driving belt tension.

For trimming cloth wheels, the holder illustrated in Fig. 5 is used witha round nose knife 89, as shown in Fig. 6, which is retained in the slot9| by set screws 93.

After a cloth wheel has been used for some time, it becomes matted down.To rake out the wheel so that it may be made serviceable for furtheruse, it is customary to use a wooden stick with protruding nails, heldin the hand of the operator. The holder and tool of Figs. '7 and 8 areadapted to rake out cloth wheels, eliminating the danger present when ahand-held rake is used. U-shaped teeth 95 are inserted in holes in theextension 91 on the holder, and held securely by set screws 99. Y

The operation of the truing device when applied to a machine of the typeshown in the drawings, is as follows:

In normal operation of the machine, i. e., when it is grinding orpolishing the work presented to it, the truing device will be swung ortipped backwardly into the position shown in dotted outline in Fig. 1,where it can in no way interfere with the view or manipulations of theoperator or the grinding operation of the machine.

When it is desired to true the grinding or polishing wheel, the truingdevice will be tipped forwardly, until its contact face engages theabutment 2|, and the threaded socket 25 on the spindle 21 registers withthe fixed threaded stud 23 projecting from the abutment 2| on wheelhood, the spindle being raised at this time in its bearing in the armII. On rotation of the hand wheel 29, the threaded socket 25 will bescrewed down on the stud 23 until the arm ll carrying bring the abrasivestick into proper position, the

parts being secured by the tightening of the clamping bolts 36 and 4|.

In order to bring the polishing wheel and truing tool into properrelative position, the wheel will be adjusted forwardly or backwardly,as the case may be, by means of the screw shaft 15 and hand wheel 13,thereby swinging the wheel support lever 6'! about its pivot 69 to bringthe hand wheel 13 of the screw shaft 15.

- After the truing of the Wheel has been completed, the truing" devicewill be released by reversing the rotation of the threaded sleeve andspindle 25 and 21, and the whole device turned backwardly into itsoriginal dotted line position in Fig. '1.

Wher the knife or rake is used in place of the abrasive stick themanipulations and operations will be exactly the same except as to thecharacter of the truing action of the tool, the uneven surface ofthecloth or felt wheel being cut away by the round nose knife 89 and thematted or hardened surface of the cloth wheel being loosened up by therake teeth 95.

While it is not essential that the particular form of tool holderillustrated in Fig. 4 be used, this has been found most satisfactory inactual use, the arrangement of the clamping faces, shoulders andabutments not only resulting in the tool or abrasive stick being heldfirmly in fixed position, but the liability of fracture of the abrasivestick, present in other types of holder, is avoided.

Nor is the truing device as a Whole limited to the details ofconstruction herein shown and described, as the form and arrangement ofthe various parts may be modified and varied without departing from theinvention as set forth in the appended claims.

' 'Having thus described the invention, what is claimed is: a

1. A truing device for polishing wheels and the'like' comprising aguideway, a carriage on said guideway, means for moving the carriage onthe guideway, and a tool holder on the carriage, the holder comprisingan abutment member and a co-operating clamping member for supportingtherebetween the truing tool, the abutment and clamping members eachhaving tool engagingfaces at right angles to one another, the faces onone member being opposite the faces on the other member whereby the toolis clamped between opposite pairs of clamping faces.

2. A tool holder for polishing machines and the like, comprisingan-abutment member having a plurality of clamping faces and a threadedopening, aclamping member having a plurality of clamping faces and astop for engaging the abutment member, and a bolt passing through theclamping member between the clamping faces on one side and the stop'onthe other and entering the threaded opening for clamping atool inposition between the abutment and the clamping members, the stop on theclamping member preventing tilting of said member.

3. A tool holder for polishing machines and the like, comprising anabutment member, a clamping member having a plurality of spaced clampingfaces, means laterally disposed with respect to the clamping faces forforcing the j members toward one another to clamp a tooltherebetweengone of said members having provision for maintaining themembers in proper angular relation.

7 4. In a. polishing machine or the like, the combination with arotating wheel, a casing enclosing the wheel and provided with aclamping abutment and lug at the top and an opening for the presentationof the work in the front thereof, a truing device comprising an armpivoted on the lug on an axis parallel to the axis of the wheel andhaving a clamping face for engagement with the abutment when the truingdevice is swung forwardly on its pivotal support, and a truing toolmounted on the arm, the tool being projected through the opening toengage the face of the wheel when the device is swung forwardly, thedevice being adapted to be swung rearwardly to rest upon the casing ininoperative position distant from said opening, and means for clampingthe face on the arm in engagement with the abutment on the casing tohold the truing device in fixed operative position.

5. In a polishing machine or the like, the combination with a rotatingwheel, of a circular casing enclosing the wheel and provided with aperipheral opening for the presentation of the work to the wheel, atruing device comprising an arm pivotally mounted at one end on thecasing on an axis parallel to the axis of rotation of the wheel and atruing tool mounted at the other end of the arm, the pivot of the armbeing positioned on the periphery of the casing to permit movement ofthe arm in the plane of rotation of the wheel to cause the tool toextend through the opening in the casing to engage the face of the wheelwhen the arm is swung forwardly into operative position, and to restupon the periphery of the casing in the rear of the pivot when the armis swung rearwardly the arm is swung forwardly, and means for rotatingthe sleeve while in engagement with the screw to draw the arm intooperative position and said abutments into clamping engagement, therebyto position and fixedly secure the arm with relation to the wheel.

RUFUS W. FULLER.

